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Psychobiotic

Psychobiotics is a term used in preliminary research to refer to live bacteria that, when ingested in appropriate amounts, might confer a mental health benefit by affecting microbiota of the host organism.[1] Under research is whether bacteria might play a role in the gut-brain axis. However, as of 2018, there is a paucity of randomized controlled trials testing the effects of live, ingested bacterial strains on clear mental health outcomes, and those that have been done provide inconclusive results when viewed in aggregate.[2][3]

Research

The field of psychobiotics in humans is nascent, though there have been many studies in rodents demonstrating increased cognitive functioning, decreased anxiety, and decreases in stress related pathology.[1] However, the human literature has yet to catch up with most rodent experiments, and has so far failed to produce a high number of well designed, randomized trials. Several recent reviews have highlighted the fact that there is a need for more diverse human studies, particularly because those that exist are often hard to compare and have contradictory outcomes.[2][3]

Species

Lactobacillus acidophilus

Several species of bacteria have been used in probiotic psychobiotic research:[5][6]